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流过毛细管的电流,将直接影响箍缩过程中等离子体的状态,进而影响软X射线激光的产生。由于主开关的导通电感将影响电流波形,因此提出了使用不同结构的主开关电极来改变毛细管电流波形的方案,以寻找最适合毛细管放电软X射线激光产生的电流波形。实验用三种不同结构的主开关电极,观察了主开关导通电感的改变及其对电流波形的幅值和脉宽的影响。根据导通电感的估算结果,利用脉冲功率理论,计算了电流幅值和脉宽的改变情况,并与实验结果进行了比较。实验观察了电流波形的改变对软X射线激光尖峰信号的影响。实验结果表明,放电间隙为3 cm的圆环-圆盘型主开关最适合软X射线激光的输出。
The current flowing through the capillary will directly affect the state of the plasma during the pinch process, thereby affecting the soft X-ray laser generation. Since the on-resistance of the main switch will affect the current waveform, a scheme of using different structure main switch electrodes to change the capillary current waveform is proposed to find the most suitable current waveform for the capillary discharge soft X-ray laser. Three kinds of main switch electrodes with different structures were experimentally studied, and the change of on-state inductance of the main switch and its influence on the amplitude and pulse width of the current waveform were observed. According to the estimation of on-state inductance, the change of current amplitude and pulse width is calculated by using the pulse power theory, and compared with the experimental results. The effect of the change of current waveform on the laser spike of soft X-ray was observed experimentally. Experimental results show that the ring-disc type main switch with discharge gap of 3 cm is the most suitable for the output of soft X-ray laser.